JPH08214981A - Seat reclining device for vehicle - Google Patents

Abstract

PURPOSE: To provide a two step foldable seat reclining device for a vehicle, by which problems of lack in rigidity and undesirable linkage in the device can be solved. CONSTITUTION: On a free hinge device used as a pair together with a two step foldable seat reclining device A of which upper arm 7 is pivotally supported via a shaft 6 as a broken type hinge to a lower art 4 pivotally supported by a center shaft to a base plate 1, the seat reclining device A and a free hinge device are connected by a connection pipe 30 as a supporter having an axis line in adjacency of the axis line of the broken type hinge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat reclining device capable of two-stage folding in a vehicle seat such as an automobile.

[0002]

2. Description of the Related Art A vehicle seat reclining device for a vehicle seat is provided for ensuring a comfortable seating and a safe driving posture of an occupant. A seat back is adjusted to a desired inclination angle by a seat reclining device. I am able to do it.

This vehicle seat reclining device is
An arm is rotatably attached to a base plate fixed to the seat cushion via a center shaft, and a seat back is fixed to the arm.

The vehicle seat reclining device may be mounted as a pair on the left and right sides of the rear portion of the seat cushion, but it is usually provided on only one of them and a free hinge device is used on the other. Is.

By the way, recently, there has been provided a two-stage folding seat reclining device capable of tilting forward so that the seat back overlaps the seat cushion substantially in parallel, whereby the vehicle compartment space above the seat back is used as a luggage loading room. It is made available (see Japanese Patent Publication No. 57-9973).

In this case, the arm fixed to the seat back is divided into two parts. Therefore, when the reclining is set, the two divided arms rotate as a unit, but when the seat back is tilted forward, only the upper arm rotates. The arm has two centers, the center hinge of the lower arm and the center folding hinge of the upper arm and the lower arm, so that the seat back can be rotated so as to overlap the seat cushion.

On the other hand, a free hinge device used as a pair with the seat reclining device is an upper arm fixed to a seat back, and is rotatably attached to the upper arm through a hinge for folding, and the seat is seated. The lower arm is rotatably attached to a base plate fixed to the cushion via a center hinge.

[0008]

However, since the arm is provided with the center hinge and the center folding hinge, the rigidity of the arm is lowered and the free reclining device is synchronized with the seat reclining device. Therefore, a malfunction that does not work together easily occurs.

In order to solve this problem, in general, a seat reclining device is provided with a lock device between an upper arm and a lower arm centering on a center folding hinge.
The free hinge device is provided with a locking mechanism centered on at least one of the center shaft and the center hinged hinge, and a tension spring or a spiral spring for urging the upper arm to prevent waist collapse. ing.

However, if the lock mechanism is provided or the spring or the spring is used, the number of parts is increased, the structure is complicated, and the assembling property is deteriorated, resulting in an increase in cost. There is.

Therefore, the present invention has been made in view of the above circumstances.
It solves the problem of insufficient rigidity and poor interlocking performance of the two-stage folded seat reclining device.

[0012]

In a seat reclining device according to the present invention, a lower arm rotatably supported on a base plate by a center shaft is rotatably supported by an upper arm via an intermediate folding hinge. In the two-stage folded seat reclining device and the free hinge device used in combination with the same, the seat reclining device and the free hinge device are connected by a support body having an axis near the axis of the center folding hinge. .

[0013]

By interposing a connecting pipe having an axis near the axis of the center-folded hinge between the reclining device and the free hinge device, a rigid frame structure is formed to improve the rigidity of the reclining device and the free hinge device. In addition to improving the rigidity of the arm that supports the seat back and the improper operation of the device, the free hinge follows the seat reclining device well and smoothly interlocks.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, in a seat reclining device A, an upper part 3 is rotatably attached to a base plate 1 via a center shaft 2, a lower arm 4 is connected to the upper part 3, and a lower arm 4 is attached. An upper base plate 5 is connected to the upper base plate 5, and an upper arm 7 is rotatably attached to the upper base plate 5 via a shaft 6. Therefore, the lower arm 4 can be rotated via the center shaft 2 and the upper arm 7 can be rotated via the shaft 6 serving as a folding hinge, so that the upper arm 7 covers the base plate 1 as shown by phantom lines. You can move forward.

In order to set the inclination angle of the lower arm 4 and lock it, the upper part 3 is formed with teeth 8 around the center shaft 2 with a predetermined radius.
Lower tooth 10 having teeth 9 that mesh with the teeth 8.
Is rotatably supported on the base plate 1 by a shaft 11. A pin 13 having a roller 12 that abuts the lower portion of the free end of the lower tooth 10 has a shaft 15 attached to the base plate 1.
The operation lever 16 is rotatably supported by the operation lever 16 and is projected. The operating lever 16 is always urged to rotate clockwise by the ammunition 17. Also, the pin 13 is the base plate 1
The movement of the lever is regulated by abutting on the elongated hole 14 opened at.

In order to set the inclination angle of the upper arm 7 and lock it, the upper base plate 5 is provided with a shaft 6
A tooth member 20 having circumferential teeth 18 and 18a having a predetermined radius centered around the tooth and having teeth 19 meshing with the circumferential teeth 18 and 18a is rotatably attached to the upper arm 7 by a shaft 21. It is supported. The tooth member 20 has a cam engaging portion 22, and a cam 23 that engages and disengages with the cam engaging portion 22 has a shaft 24.
Is engaged with the different-diameter cross-section such as an oval-shaped cross section provided on the upper arm 7 and is rotatably supported by the upper arm 7.

Inside the upper base plate 5, the tooth member 20, and the cam 23 (opposite to the upper arm 7), a substantially triangular holder plate 54 having the shaft 6, the shaft 21, and the shaft 24 as vertices is fitted. Covering. Axis 24
A connecting plate 53 for transmitting the movement of the cam 23 to the free hinge device B is fitted to the free hinge device B with a different diameter cross section such as an oval cross section. In addition, a lever 25 for tilting forward is provided outside the upper arm 7.
Is fixed, the lever 25, the cam 23, and the connecting plate 53 rotate integrally. Further, 25a is a knob for covering the lever 25 for tilting forward. The cam 23 is always urged to rotate clockwise by the bullet 26.

A bracket 27 is attached to the upper end of the lower arm 4.
As shown in FIG. 5, while being inserted into the connecting pin 28 and being fixedly connected by the bolt 29 and the nut 29a, the connecting pipe 30 as a support member is orthogonally connected to the bracket 27. Reference numeral 30 denotes a seat reclining device A having an axis line common to the shaft line of the shaft 6.
It extends to the side of the free hinge device B opposite to. In addition,
On the outer side of the lower arm 4, a center shaft 2, a shaft 11,
A substantially triangular holder plate 50 having 15 as an apex is fitted and covered, and further, an inner end portion of the spiral spring 51 is locked to the center shaft 2, and an outer end portion of the spiral spring 51 projects from the lower arm 4. The lower arm 4 is locked to the stopper 52 and is always biased to rotate forward.

The connecting pipe 30 does not have to have an axis line common with the axis line of the shaft 6, and if necessary, the same effect can be achieved if it is arranged in the vicinity of the axis line of the shaft 6.

On the other hand, as shown in FIG. 3, in the free hinge device B in which the connecting pipe 30 is extended and connected, the lower arm 34 is rotatably attached to the base plate 31 fixed to the seat cushion by the center shaft 32. Support, connect the upper base plate 35 to the lower arm 34,
An upper arm 37 is rotatably supported by a shaft 36 on an upper base plate 35. Therefore, the lower arm 34 can rotate via the center shaft 32, and the upper arm 37 can rotate via the shaft 36. The upper arm 37 can tilt forward on the base plate 31 as shown in phantom lines.

In order to set the inclination angle of the upper arm 37 and lock it, the upper base plate 35 is formed with circumferential tooth portions 38, 38a having a predetermined radius around the shaft 36, and the circumferential tooth portions 38, 38a are formed. Tooth portion 39 that meshes with
A tooth member 40 having a shaft is rotatably supported on the upper arm 37 by a shaft 41. The tooth member 40 has a cam engaging portion 42, and a cam 43 that engages and disengages with the cam engaging portion 42 engages with a different diameter cross section such as an oval cross section provided on a shaft 44,
It is rotatably supported by the upper arm 37. The upper base plate 35, the tooth member 40, the cam 43
Inside the shaft (opposite the upper arm 37), the shaft 3
6, a substantially triangular holder plate 64 having the shaft 41 and the shaft 44 as vertices is fitted and covered. A connecting plate 63 for transmitting the movement of the cam 23 from the seat reclining device A is engaged with the shaft 44 in a different diameter cross section such as an oval cross section. The cam 43 is always urged to rotate clockwise by the bullet 46.

A bracket 47 is attached to the upper end of the lower arm 34.
Is fixed by a bolt 48 and a nut 48a, and is inserted into a connecting pin 49 to be connected, and the connecting pipe 30 is connected to the bracket 47 at a right angle (see FIG. 6). The sheet has a common axis with the axis and extends toward the seat reclining device A side.

As shown in FIG. 7, the side frames 59, 6 are provided on both sides of the seat back frame 60 of the seat back.
9 are provided, and the upper arms 7 and 37 are fixed to the lower portions of the side frames 59 and 69 by bolts, respectively. A connecting pipe 55 is pierced through the lower portions of the side frames 59 and 69 to be rotatably supported, and levers 56 are fixed to both ends thereof. A long hole 56a is formed at the free end of the connecting lever 56, and the connecting pin 53a protruding from the connecting plate 53 on the seat reclining device A side and the connecting plate 63 on the free hinge device B side are formed.
The connecting pin 63a projecting from the lever is inserted into the elongated hole 56a to transmit the operation of the forward tilting lever 25. The side frames 59, 69 are formed with holes 57 for attaching the upper arms 7, 37 with bolts, and nuts 58a are fixed to the inner surfaces of the holes 57.

The operation of the above embodiment will now be described. When the seat is used for sitting, the upper base plate 5,
35 and the upper arms 4 and 34 in relation to the tooth members 20 and 4
0 teeth 19, 39 and upper base plates 5, 35
1 and FIG. 3 in which the circumferential tooth portions 18 and 38 of the recliner are engaged with each other and locked, and in this state, the reclining adjustment is performed by rotating the operation lever 16 of the reclining device A upwards. Moves the free end of the cam 23 and the cam 23 rotates counterclockwise about the shaft 24, so that the meshing of the teeth 9 and 8 is released, and the force of the spiral spring 51 causes the lower arm 4 to move. Falls forward.

Therefore, in order to set a desired inclination angle of the lower arms 4 and 34 and the upper arms 7 and 37 which are integrated with the lower arms 4 and 34, the seat back is pushed to move the lower arms 4 and 34 and the upper base plates 5 and 35. When the interposing upper arms 7 and 37 are tilted rearward, the tilt angle is set to a desired angle, and the operating lever 16 is released, the lower tooth 10 moves the shaft 11 through the roller 12 of the reclining device A.
It rotates by rotating in the clockwise direction centering around and the teeth 9 and 8 are engaged with each other to be locked.

When the upper arms 4 and 34 are folded in two stages to form a cargo loading space, the forward tilting lever 25 is used for the shaft 2.
4 is rotated counterclockwise about the connecting plate 5
The cams 23, 43 rotate in the same direction about the shafts 24, 44 through the shafts 3, 63, the connecting lever 56, and the connecting pipe 55, respectively, whereby the tooth members 20, 40 rotate counterclockwise. The teeth 19, 18 and 39, 38 are disengaged from each other, so that the upper arms 4, 34 are rotatable about the shafts 6, 36 in the counterclockwise direction.

As described above, the rotation of the shaft 24 is caused by the connection pipe 5.
5 is transmitted to the shaft 44 of the free hinge device B, the upper arm 37 of the free hinge device B and the upper base plate 35 are unlocked, and the upper arm 37 is similarly rotatable. . Therefore, tooth 1
The upper arms 7 and 37 are locked in a state substantially orthogonal to the lower arms 4 and 34 by engaging the teeth 9 and 39 with the teeth 18a and 38a.

In this case, in the free hinge device B, the lower arm 34 is rotatable about the center shaft 32 and the upper arm 37 is rotatable about the shaft 36. Since the connecting pipe 30 having the same axis as the upper arm 7 and the lower arm 4 forms a rigid support structure, the upper arms 7 and 37 form the shaft 36.
Since it pivots about, the action of so-called hip breaking does not occur between the upper arm 37 and the lower arm 34 of the free hinge device B. Therefore, it was necessary in the past.
Eliminates the need for tension or spiral springs to urge the upper arm to prevent hip cramps.

Thus, by interposing the shafts 6 and 36, that is, the connecting pipe 30 having the same axis as the axis of the center folding hinge between the reclining device A and the free hinge device B, the free hinge device B is interlocked and the seat back is moved. The supporting rigidity of the seat is improved, and the free reclining device B smoothly follows the seat reclining device A and synchronizes with the seat reclining device A.

[0030]

According to the present invention described above, since the seat reclining device and the free hinge device are connected by the interlocking support having an axis near the center folding hinge, a ramen structure is formed between them. The support rigidity of the upper arm is improved, the preferential interlocking of the upper arm is improved, and the possibility of hip fracture is eliminated, and by doing so, it is possible to omit the parts that conventionally provided biasing force and resistance. Since these parts can be omitted, the space in the width direction of the seat can be reduced. In addition, the conventional urging force causes a feeling of looseness and becomes a feeling of bending.

[Brief description of drawings]

FIG. 1 is a front view of a seat reclining device according to the present invention.

FIG. 2 is a sectional side view of FIG.

FIG. 3 is a front view of a free hinge device according to the present invention.

4 is a sectional side view of FIG.

FIG. 5 is a partial sectional view.

FIG. 6 is a partial sectional view.

FIG. 7 is a perspective view of a seat back frame.

[Explanation of symbols]

 A ... Seat reclining device B ... Free hinge device 1, 31 ... Base plate 2, 32 ... Center shaft 3 ... Upper parts 4, 34 ... Lower arm 5, 35 ... Upper base plate 6, 36 ... Shaft 8, 9, 18, 19, 38, 39 ... Tooth part 10 ... Lower tooth 20, 40 ... Tooth member 23, 43 ... Cam 25 ... Forward lever 27 ... Bracket 28 ... Screw 30 ... Connection pipe (support)

Claims (2)

[Claims] 1. A two-stage folding seat reclining device in which a lower arm rotatably supported by a center shaft on a base plate is rotatably supported by an upper arm via a middle folding hinge. A vehicle seat reclining device in which left and right lower arms are connected by a support having an axis near the axis of the hinge. 2. A two-stage folding seat reclining device in which a lower arm rotatably supported by a center shaft on a base plate and an upper arm rotatably supported by a center folding hinge, and a pair thereof. In the free hinge device to be used, a seat reclining device for a vehicle, wherein the seat reclining device and the free hinge device are connected by a support body having an axis near the axis of the center folding hinge.